A lower density operator for the Borel algebra
General Topology
2019-11-04 v1
Abstract
We prove that the existence of a Borel lower density operator (a Borel lifting) with respect to the -ideal of countable sets, for an uncountable Polish space, is equivalent to the Continuum Hypothesis.
Keywords
Cite
@article{arxiv.1903.02397,
title = {A lower density operator for the Borel algebra},
author = {Marek Balcerzak and Szymon Głab},
journal= {arXiv preprint arXiv:1903.02397},
year = {2019}
}